Add keyboard shortcut to clear additional restriction

manual/gui.rst

@@ -586,6 +586,8 @@ Calibre has several keyboard shortcuts to save you time and mouse movement. Thes
       - Focus the book list
     * - :kbd:`Ctrl+Esc`
       - Clear the virtual library
+    * - :kbd:`Alt+Esc`
+      - Clear the additional restriction
     * - :kbd:`N or F3`
       - Find the next book that matches the current search (only works if the highlight checkbox next to the search bar is checked)
     * - :kbd:`Shift+N or Shift+F3`

src/calibre/gui2/search_restriction_mixin.py

@@ -549,6 +549,9 @@ class SearchRestrictionMixin(object):
                 restriction = ''
             self._apply_search_restriction(restriction, r)
 
+    def clear_additional_restriction(self):
+        self._apply_search_restriction('', '')
+
     def _apply_search_restriction(self, restriction, name):
         self.saved_search.clear()
         # The order below is important. Set the restriction, force a '' search

src/calibre/gui2/ui.py

@@ -279,6 +279,13 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, EmailMixin,  # {{{
                 action=self.ctrl_esc_action)
         self.ctrl_esc_action.triggered.connect(self.ctrl_esc)
 
+        self.alt_esc_action = QAction(self)
+        self.addAction(self.alt_esc_action)
+        self.keyboard.register_shortcut('clear additional restriction',
+                _('Clear the additional restriction'), default_keys=('Alt+Esc',),
+                action=self.alt_esc_action)
+        self.alt_esc_action.triggered.connect(self.clear_additional_restriction)
+
         ####################### Start spare job server ########################
         QTimer.singleShot(1000, self.add_spare_server)